const createError = require('http-errors');
const express = require('express');
const session = require('express-session');
const flash = require('connect-flash');
const path = require('path');
const cookieParser = require('cookie-parser');
const logger = require('morgan');
const winston = require('winston');
const expressWinston = require('express-winston');

const routes = require('./routes');
const config = require('./config');

const app = express();

// view engine setup
// app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(express.static(path.join(__dirname, 'upload')));

// routes
app.use('/', routes);

// 中间件，用来显示通知
app.use(flash());

// catch 404 and forward to error handler
app.use(function(req, res, next) {
    next(createError(404));
});

// 添加模板必需的三个变量
app.use(function(req, res, next) {
    res.locals.user = req.session.user
    res.locals.success = req.flash('success').toString()
    res.locals.error = req.flash('error').toString()
    next()
})

//设置跨域访问
app.all('*', function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Content-Type,Content-Length, Authorization, Accept,X-Requested-With");
    res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
    res.header("X-Powered-By", ' 3.2.1')
    next();
});

// 正常请求的日志
app.use(expressWinston.logger({
    transports: [
        new(winston.transports.Console)({
            json: true,
            colorize: true
        }),
        new winston.transports.File({
            filename: 'logs/success.log'
        })
    ]
}))
// 错误请求的日志
app.use(expressWinston.errorLogger({
    transports: [
        new winston.transports.Console({
            json: true,
            colorize: true
        }),
        new winston.transports.File({
            filename: 'logs/error.log'
        })
    ]
}))

// error handler
app.use(function(err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};

    // render the error page
    res.status(err.status || 500);
    res.render('error');
});

module.exports = app;